“KGI analyst Ming-Chi Kuo, in a report this morning, states that both 4.7- and 5.5-inch models of the iPhone 6 will be launched next week and will both offer 128GB storage option,” Ben Lovejoy reports for 9to5Mac.

“If Apple retains its usual three-tier structure this would suggest 32GB, 64GB and 128GB models – though it could be that 128GB would be a fourth tier, as with its iPad Air models,” Lovejoy reports. “Or, as a previous report suggested, Apple could keep the 16GB option as a very low price tier and skip 32GB.”

Lovejoy reports, “The same report predicts that the iPad Air 2 will be announced on the same day as the iPhone 6 rather than in a separate event in October.”

So…
We could have three tiers: 32 GB, 64 GB, and 128 GB.
OR
We could have three tiers: 16 GB, 64 GB, and 128 GB.
OR
We could have four tiers: 16 GB, 32 GB, 64 GB, and 128 GB.

I’m sure glad that article cleared things up for me!

(Though they really left out two more possible variants:
We could have three tiers: 16 GB, 32 GB, and 64 GB (like now).
OR
We could have three tiers: 16 GB, 32 GB, and 128 GB. (replace the 64 GB with a larger 128 GB)